[PATCH v3 03/10] drm/imx: atomic phase 1: Use transitional atomic CRTC and plane helpers

[Russell King - ARM Linux]

On Mon, Jul 04, 2016 at 03:40:32PM +0800, Liu Ying wrote:
> Use the drm_plane_helper_update/disable() and drm_helper_crtc_mode_set()
> transitional atomic helpers.  The crtc->mode_set_nofb callback is added
> so that the primary plane is no longer tied to the CRTC.  Check/update
> logics are separated to make sure crtc->mode_set_nofb and plane->atomic_update
> are always successful.  Also, some necessary logics are tweaked for a smooth
> transition.
> 
> Signed-off-by: Liu Ying <gnuiyl at gmail.com>

This patch causes a regression with my xorg ddx driver:

[    29.850] (EE) armada(0): [drm] failed to set mode on crtc 24: Invalid argument

I'm not sure why (yet).

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